Philetus b



(No ModeL) P. B. OONKLIN.

Lathe.

No. 237,487. Patented Feb. 8,1881! N. PETERS, FHDTO-LITHOGRAFHER,WASHINGTON, D C.

UNITED STATES PATENT @rrrcn.

PHILETUS B. GONKLIN, or NEWARK, NEw'JERsEY, ASSIGNOR TO ROBERT s.REDMAN, or SAME PLACE.

LATH E.

SPECIFICATION forming part of Letters Patent No. 237,487, dated February8, 1881.

Application filed April 10, 1880. (No model.)

To all whom it may concern:

Be it known that I, PHILETUs B. GoNKLiN, of Newark, in the county ofEssex and State of New Jersey, have invented certain new and usefulImprovements in Lathes, of which the following is a full, clear, andexact description, which will enableiothers skilled in the art to makeand use the same, reference being had to the accompanying drawings,forming part IQ of this specification, in which-- Figure 1 represents asectional side elevation showing my invention. Fig. 2 is a sideelevation of the same.

Similar letters of reference indicate corresponding parts.

The object of this invention is to construct a neat, cheap, andserviceable lathe especially adapted for jewelers, dentists, and lightwork, where great accuracy is required.

My invention consists in the various details of construction, which willbe hereinafter more fully described, and then pointed out in the claims.

In the case here presented A represents the 2 5 main frame whichsupports the whole lathe.

B is a solid round metal rod, which extends through the main frame, andis held adjustably in position by the thumbscrew O. The said rod B hasthe back head, D, rigidly at- 0 tached to its extremity by the pin E,and has a centering line or mark made its full length, so as to enableit to be set at any point with the corresponding work on the main frame,in order that the back head may 3 5 be set in true line with the fronthead. That part of the main frame A in which the spindleF rests has itsbearings made conical to correspond with the inward taper, Gr, of theforward end of the spindle, and also to corre- 4o spond with the inwardtaper, H, of the hub of the balance-wheel, so that by slackening thescrew I on the hub and tightening the screw J, which extends through thehollow or raised washer a into the extremity of the spindle, it willallow the wear or lost motion to be taken up, as occasion may require.The chuck K is also tapered inwardly, and fits in a corresponding recessin the forward end of the spindle, and is held secure in position by thecap-nut L, as shown in the drawings.

The tool-rest holder U is cored out and fitted on the round iron bar B,and is clamped in position by the thumb-screw S. The toolrest W itselfis set in a hollow boss, V, and clamped at such angle as required by thethumb-screw T.

It will be observed that by securing the back head fast on the rod B,and constructing the front head, A, so that the rod slides through it, Ican turn the back head and rest both together, and adjust them both byturning a single screw; whereas if the bar B were made in one piece withor fast in the head A it would be necessary to loosen two screws to turnthe back head and rest to one side of the center.

The bushing M, which serves to hold the stem of the screw N in the backhead, is held locked in position by the pin 0.

The traveling socket P, which is operated by the screw N, has a portionof its under side cut away, in order to produce a flat surface, so thatby inserting a pin, as shown at Q, the same will be kept from. turningin its travel.

It will thus be seen that by simply removing the pin 0, which looks thebushing, the hand-wheel with screw and bushing may be removed bodily tothe rear, and the center or traveling socket be withdrawn from the frontof the back head, thereby greatly simplifying the construction andlessening the cost of manufacture.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The combination, with the front head, A, of the bar B, constructed toslide and turn in an orifice in said head A, with the back head,

D, securely fastened on bar B, and turning 0 therewith, whereby bothback head and rest may be turned simultaneously, and both adjustedtogether by the screw 0, substantially as described.

2. In a lathe, the combination of the bal- 5 ance-wheel and tapering hubH with the screw J, hollow washer to, and spindle 1*, the same ing'constructed, arranged, and operated in being constructed, arranged, andoperating the manner and for the use and purpose detogether in themanner and for the use and scribed purpose described. PHILETUS B.OONKLIN.

3. In a lathe, the bushing M, pin 0, flat- I Vitnesses: tened centers0cket,]?,a,11d pin Q, jointly with JOHN MILLs,

the back head, I), and screw N, the same be- 1 CHARLES H. NAsH.

